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1 cze 2021 · Standard SQL Functions Cheat Sheet. TEXT FUNCTIONS. CONCATENATION. Use the || operator to concatenate two strings: SELECT 'Hi ' || 'there!'; -- result: Hi there! Remember that you can concatenate only character strings using ||. Use this trick for numbers: SELECT '' || 4 || 2; -- result: 42.
Whether you need a quick reference for major SQL concepts before an interview, or you want to level-up your existing SQL skills, our SQL cheat sheet is the ideal starting point. Plus, we’ve broken it down into 11 essential SQL topics to help you get the most from this SQL query cheat sheet.
Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Start learning SQL now » Examples in Each Chapter
2 wrz 2024 · SQL Cheat Sheet PDF. Create a Database in SQL. Explore this section to get hands on all the cheat sheet that help you in order to create a database in SQL. 1. CREATE DATABASE: Create a New Database. CREATE DATABASE company; This command creates a new database named "company." 2. USE: Select a Specific Database to Work With. USE company;
CREATE OR REPLACE PROCEDURE total_val (IN Member# CHAR(6), OUT total DECIMAL(12,2)) LANGUAGE SQL BEGIN. SELECT SUM(curr_balance) INTO total FROM accounts WHERE account_owner=Member# AND account_type IN ('C','S','M'); END. CALL it from an SQL interface.
Example: Returns users and their subscriptions, along with a new column called activity_levels that makes a judgement based on the number of subscriptions. SELECT first_name, surname, subscriptions CASE WHEN subscriptions > 10 THEN 'Very active' WHEN Quantity BETWEEN 3 AND 10 THEN 'Active' ELSE 'Inactive' END AS activity_levels FROM users; CHECK
SQL statements are the means by which programs and users access data in an Oracle database. The sections that follow show each SQL statement and its related syntax.
